C# 解密文件结尾处缺少约10个字符

我使用C#中的

RC2CryptoServiceProvider

编写了加密/解密方法，由于某种原因，我无法让我的解密程序解密最后的几个字节。文件好像刚被剪掉。我的加密方法如下所示：

    public static byte[] EncryptString(byte[] input, string password)
    {
        PasswordDeriveBytes pderiver = new PasswordDeriveBytes(password, null);
        byte[] ivZeros = new byte[8];
        byte[] pbeKey = pderiver.CryptDeriveKey("RC2", "MD5", 128, ivZeros);

        RC2CryptoServiceProvider RC2 = new RC2CryptoServiceProvider();

        byte[] IV = new byte[8];
        ICryptoTransform encryptor = RC2.CreateEncryptor(pbeKey, IV);

        MemoryStream msEncrypt = new MemoryStream();
        CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
        csEncrypt.Write(input, 0, input.Length);
        csEncrypt.FlushFinalBlock();

        return msEncrypt.ToArray();
    }

    public static byte[] DecryptString(byte[] input, string password, int originalSize)
    {
        PasswordDeriveBytes pderiver = new PasswordDeriveBytes(password, null);
        byte[] ivZeros = new byte[8];
        byte[] pbeKey = pderiver.CryptDeriveKey("RC2", "MD5", 128, ivZeros);

        RC2CryptoServiceProvider RC2 = new RC2CryptoServiceProvider();

        byte[] IV = new byte[8];
        ICryptoTransform decryptor = RC2.CreateDecryptor(pbeKey, IV);

        MemoryStream msDecrypt = new MemoryStream();
        CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Write);

        csDecrypt.Write(input, 0, originalSize);
       // csDecrypt.FlushFinalBlock();

        char[] decrypted = new char[input.Length];
        decrypted = System.Text.Encoding.UTF8.GetChars(msDecrypt.ToArray());
        return msDecrypt.ToArray();

    }

而我的解密看起来像：

    public static byte[] EncryptString(byte[] input, string password)
    {
        PasswordDeriveBytes pderiver = new PasswordDeriveBytes(password, null);
        byte[] ivZeros = new byte[8];
        byte[] pbeKey = pderiver.CryptDeriveKey("RC2", "MD5", 128, ivZeros);

        RC2CryptoServiceProvider RC2 = new RC2CryptoServiceProvider();

        byte[] IV = new byte[8];
        ICryptoTransform encryptor = RC2.CreateEncryptor(pbeKey, IV);

        MemoryStream msEncrypt = new MemoryStream();
        CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
        csEncrypt.Write(input, 0, input.Length);
        csEncrypt.FlushFinalBlock();

        return msEncrypt.ToArray();
    }

    public static byte[] DecryptString(byte[] input, string password, int originalSize)
    {
        PasswordDeriveBytes pderiver = new PasswordDeriveBytes(password, null);
        byte[] ivZeros = new byte[8];
        byte[] pbeKey = pderiver.CryptDeriveKey("RC2", "MD5", 128, ivZeros);

        RC2CryptoServiceProvider RC2 = new RC2CryptoServiceProvider();

        byte[] IV = new byte[8];
        ICryptoTransform decryptor = RC2.CreateDecryptor(pbeKey, IV);

        MemoryStream msDecrypt = new MemoryStream();
        CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Write);

        csDecrypt.Write(input, 0, originalSize);
       // csDecrypt.FlushFinalBlock();

        char[] decrypted = new char[input.Length];
        decrypted = System.Text.Encoding.UTF8.GetChars(msDecrypt.ToArray());
        return msDecrypt.ToArray();

    }

---

被解密的字符[]

返回被解密的整个文件，除了文件以

结尾外，当解密时，我只得到第一个

是否有理由将Flush（）注释掉？你试过完全关闭你的流吗？
唉，我大约在一个月前打过这场战斗，也有一个非常类似的问题，只是最后我经历了太多。托雷是我的解决办法

你在做一些奇怪的事情，我不太确定。在不必要的时候使用cryptostreams，出于某种奇怪的原因跟踪原始长度，并且使用不推荐的类。您的问题可能是填充、错误的假设（由原始长度证明）和流的错误处理（这可能很棘手）的组合。请尝试以下方法：

加密：

var rij = RijndaelManaged.Create();
rij.Mode = CipherMode.CBC;
rij.BlockSize = 256;
rij.KeySize = 256;
rij.Padding = PaddingMode.ISO10126;
var pdb = new Rfc2898DeriveBytes(password, 
          Encoding.Default.GetBytes("lolwtfbbqsalt" + password));
var enc = rij.CreateEncryptor(pdb.GetBytes(rij.KeySize / 8), 
          pdb.GetBytes(rij.BlockSize / 8));
return enc.TransformFinalBlock(unencryptedBytes, 0, unencryptedBytes.Length);

解密：

// throws a cryptographic exception if password is wrong
var rij = RijndaelManaged.Create();
rij.Mode = CipherMode.CBC;
rij.BlockSize = 256;
rij.KeySize = 256;
rij.Padding = PaddingMode.ISO10126;
var pdb = new Rfc2898DeriveBytes(password, 
          Encoding.Default.GetBytes("lolwtfbbqsalt" + password));
var dec = rij.CreateDecryptor(pdb.GetBytes(rij.KeySize / 8), 
          pdb.GetBytes(rij.BlockSize / 8));
return dec.TransformFinalBlock(encryptedBytes, 0, 
          encryptedBytes.Length);

请注意，这两个方法中唯一不同的是CreateEncryptor/CreateDecryptor，因此您可以重构出大量重复。还请注意，我在不使用任何流的情况下得到一个字节数组和一个字节数组。它也比RC2更安全一些，如果salt更随机的话就更安全了。
他正在写入两个加密流，这意味着他必须刷新这两个加密流中的最后一个块，这是肯定的。因为我收到一个运行时错误，我将其注释掉，我修复了，然后忘记了刷新。这不知怎么解决了一切。我一点也不懂，但是谢谢！所以，是的，可怜的同花顺问题再次出现了。我以前遇到过很多次。事实上，我已经让它在我的开发服务器上运行，认为一切正常，然后砰！它在生产环境中抬头——即使有相同的精确数据！疯了吧？这都是因为忘记刷新。我使用RC2，因为这也必须与一个C++应用程序兼容，它应用了RC2加密文件。